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7^(x+1) + 7^x + 7^(x-1) = 399, what is x? White light is directed at difraction grating at angle normal to gratting.starting at norml to grating 0dgre the odr of red,gren,blue wil be? =B y I y is an integer and ≤−4 A partir de qual atividade o homem relacionava-se com o tempo durante o tempo medieval? Problem involving math induction! 1. Prove for every integer p, p^2 + 3p + 8 is even.?